Thermoplastic film and method of welding same

Details Thermoplastic film and method of welding same Thermoplastic film and method of welding same

B - Operations, Transporting

29

C

B29C 65/04 (2006.01) B29C 65/00 (2006.01) C08J 5/12 (2006.01) C08J 5/18 (2006.01)

Patent

CA 2104864

A method of welding at least two layers of a thermoplastic film which comprises a copolymer or copolymer-polymer mix- ture selected from the group consisting of ethylenevinylacetate (EVA) copolymer, an EVA copolymer and polyethylene, and EVA copolymer and polypropylene, and an EVA copolymer and polyethylene and polypropylene, with the proviso that the concentra- tion of vinylacetate in said film is from about 12 to about 28 % by weight, said method comprising the steps of: pressing said at least two layers of said thermoplastic film; applying a high frequency current to said pressed layers in order to weld said layers together; and recovering said welded layers.

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